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y = 13 - 4x substitusikan ke persamaan pertama didapat:
3x - 2y = 7
3x - 2(13 - 4x) = 7
3x - 26 + 8x = 7
11x = 33
x = 3
y = 13 - 4(3) = 1
maka: (x,y) = (3,1)
4x + y - 13 = 0
3x - 2y = 7 x 4
4x + y = 13 x 3
12x - 8y = 28
12x + 3y = 39 _
-11x = -11
x = -11 : -11
x = 1
3x - 2y = 7
3 (1) - 2y = 7
3 - 2y = 7
-2y = 7 - 3
-2y = 4
y = 4 : ( -2)
y = -2
jadi, X = 1 dan Y = -2
maaf kalau salah ..